1 //=== X86CallingConv.h - X86 Custom Calling Convention Routines -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the custom routines for the X86 Calling Convention that
11 // aren't done by tablegen.
13 //===----------------------------------------------------------------------===//
15 #ifndef X86CALLINGCONV_H
16 #define X86CALLINGCONV_H
18 #include "llvm/CodeGen/CallingConvLower.h"
19 #include "llvm/IR/CallingConv.h"
23 inline bool CC_X86_AnyReg_Error(unsigned &, MVT &, MVT &,
24 CCValAssign::LocInfo &, ISD::ArgFlagsTy &,
26 llvm_unreachable("The AnyReg calling convention is only supported by the " \
27 "stackmap and patchpoint intrinsics.");
28 // gracefully fallback to X86 C calling convention on Release builds.
32 inline bool CC_X86_CDeclMethod_SRet(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
33 CCValAssign::LocInfo &LocInfo,
34 ISD::ArgFlagsTy &ArgFlags, CCState &State) {
35 // Swap the order of the first two parameters if the first parameter is sret.
36 if (ArgFlags.isSRet()) {
38 assert(ValVT == MVT::i32);
39 State.AllocateStack(8, 4);
40 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 4, LocVT, LocInfo));
42 // Indicate that we need to swap the order of the first and second
43 // parameters by "allocating" register zero. There are no register
44 // parameters with cdecl methods, so we can use this to communicate to the
48 } else if (ValNo == 1 && State.isAllocated(1)) {
49 assert(ValVT == MVT::i32 && "non-i32-sized this param unsupported");
50 // Stack was already allocated while processing sret.
51 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 0, LocVT, LocInfo));
55 // All other args use the C calling convention.
59 } // End llvm namespace